This is a interesting question, because number of Apps in Google Play Store may vary every day. For this moment we have in our database a number of 1.7 million apps. For more details about this database you can go here.
From the very beginning, one of the core services TheWebMiner provided was aggregated data and insight into the mobile app landscape. We managed to offer our clients custom aggregated data for all major mobile app marketplaces (iOS AppStore, Google Play, Amazon AppStore etc.) as well as primary analysis on the extracted data.
Now you can download for free, entire list with details about all applications (over 1,200,000 records) from Apple appstore. Link: //thewebminer.com/download